diff options
author | Kalle Valo <kvalo@codeaurora.org> | 2015-11-17 19:49:23 +0200 |
---|---|---|
committer | Kalle Valo <kvalo@codeaurora.org> | 2015-11-18 11:20:36 +0200 |
commit | 58619b14d106e453e3924810fac16a8644b04db1 (patch) | |
tree | 46f76b765f3e469cb651ae1d7dc8cafac4fc975e /drivers/net/wireless/b43/dma.c | |
parent | 30fe0f9b8c755d9aab04bb7c98ce9c7835c3bd24 (diff) |
b43: move under broadcom vendor directory
Part of reorganising wireless drivers directory and Kconfig.
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Diffstat (limited to 'drivers/net/wireless/b43/dma.c')
-rw-r--r-- | drivers/net/wireless/b43/dma.c | 1831 |
1 files changed, 0 insertions, 1831 deletions
diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c deleted file mode 100644 index 6837064908be..000000000000 --- a/drivers/net/wireless/b43/dma.c +++ /dev/null @@ -1,1831 +0,0 @@ -/* - - Broadcom B43 wireless driver - - DMA ringbuffer and descriptor allocation/management - - Copyright (c) 2005, 2006 Michael Buesch <m@bues.ch> - - Some code in this file is derived from the b44.c driver - Copyright (C) 2002 David S. Miller - Copyright (C) Pekka Pietikainen - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; see the file COPYING. If not, write to - the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor, - Boston, MA 02110-1301, USA. - -*/ - -#include "b43.h" -#include "dma.h" -#include "main.h" -#include "debugfs.h" -#include "xmit.h" - -#include <linux/dma-mapping.h> -#include <linux/pci.h> -#include <linux/delay.h> -#include <linux/skbuff.h> -#include <linux/etherdevice.h> -#include <linux/slab.h> -#include <asm/div64.h> - - -/* Required number of TX DMA slots per TX frame. - * This currently is 2, because we put the header and the ieee80211 frame - * into separate slots. */ -#define TX_SLOTS_PER_FRAME 2 - -static u32 b43_dma_address(struct b43_dma *dma, dma_addr_t dmaaddr, - enum b43_addrtype addrtype) -{ - u32 uninitialized_var(addr); - - switch (addrtype) { - case B43_DMA_ADDR_LOW: - addr = lower_32_bits(dmaaddr); - if (dma->translation_in_low) { - addr &= ~SSB_DMA_TRANSLATION_MASK; - addr |= dma->translation; - } - break; - case B43_DMA_ADDR_HIGH: - addr = upper_32_bits(dmaaddr); - if (!dma->translation_in_low) { - addr &= ~SSB_DMA_TRANSLATION_MASK; - addr |= dma->translation; - } - break; - case B43_DMA_ADDR_EXT: - if (dma->translation_in_low) - addr = lower_32_bits(dmaaddr); - else - addr = upper_32_bits(dmaaddr); - addr &= SSB_DMA_TRANSLATION_MASK; - addr >>= SSB_DMA_TRANSLATION_SHIFT; - break; - } - - return addr; -} - -/* 32bit DMA ops. */ -static -struct b43_dmadesc_generic *op32_idx2desc(struct b43_dmaring *ring, - int slot, - struct b43_dmadesc_meta **meta) -{ - struct b43_dmadesc32 *desc; - - *meta = &(ring->meta[slot]); - desc = ring->descbase; - desc = &(desc[slot]); - - return (struct b43_dmadesc_generic *)desc; -} - -static void op32_fill_descriptor(struct b43_dmaring *ring, - struct b43_dmadesc_generic *desc, - dma_addr_t dmaaddr, u16 bufsize, - int start, int end, int irq) -{ - struct b43_dmadesc32 *descbase = ring->descbase; - int slot; - u32 ctl; - u32 addr; - u32 addrext; - - slot = (int)(&(desc->dma32) - descbase); - B43_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); - - addr = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_LOW); - addrext = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_EXT); - - ctl = bufsize & B43_DMA32_DCTL_BYTECNT; - if (slot == ring->nr_slots - 1) - ctl |= B43_DMA32_DCTL_DTABLEEND; - if (start) - ctl |= B43_DMA32_DCTL_FRAMESTART; - if (end) - ctl |= B43_DMA32_DCTL_FRAMEEND; - if (irq) - ctl |= B43_DMA32_DCTL_IRQ; - ctl |= (addrext << B43_DMA32_DCTL_ADDREXT_SHIFT) - & B43_DMA32_DCTL_ADDREXT_MASK; - - desc->dma32.control = cpu_to_le32(ctl); - desc->dma32.address = cpu_to_le32(addr); -} - -static void op32_poke_tx(struct b43_dmaring *ring, int slot) -{ - b43_dma_write(ring, B43_DMA32_TXINDEX, - (u32) (slot * sizeof(struct b43_dmadesc32))); -} - -static void op32_tx_suspend(struct b43_dmaring *ring) -{ - b43_dma_write(ring, B43_DMA32_TXCTL, b43_dma_read(ring, B43_DMA32_TXCTL) - | B43_DMA32_TXSUSPEND); -} - -static void op32_tx_resume(struct b43_dmaring *ring) -{ - b43_dma_write(ring, B43_DMA32_TXCTL, b43_dma_read(ring, B43_DMA32_TXCTL) - & ~B43_DMA32_TXSUSPEND); -} - -static int op32_get_current_rxslot(struct b43_dmaring *ring) -{ - u32 val; - - val = b43_dma_read(ring, B43_DMA32_RXSTATUS); - val &= B43_DMA32_RXDPTR; - - return (val / sizeof(struct b43_dmadesc32)); -} - -static void op32_set_current_rxslot(struct b43_dmaring *ring, int slot) -{ - b43_dma_write(ring, B43_DMA32_RXINDEX, - (u32) (slot * sizeof(struct b43_dmadesc32))); -} - -static const struct b43_dma_ops dma32_ops = { - .idx2desc = op32_idx2desc, - .fill_descriptor = op32_fill_descriptor, - .poke_tx = op32_poke_tx, - .tx_suspend = op32_tx_suspend, - .tx_resume = op32_tx_resume, - .get_current_rxslot = op32_get_current_rxslot, - .set_current_rxslot = op32_set_current_rxslot, -}; - -/* 64bit DMA ops. */ -static -struct b43_dmadesc_generic *op64_idx2desc(struct b43_dmaring *ring, - int slot, - struct b43_dmadesc_meta **meta) -{ - struct b43_dmadesc64 *desc; - - *meta = &(ring->meta[slot]); - desc = ring->descbase; - desc = &(desc[slot]); - - return (struct b43_dmadesc_generic *)desc; -} - -static void op64_fill_descriptor(struct b43_dmaring *ring, - struct b43_dmadesc_generic *desc, - dma_addr_t dmaaddr, u16 bufsize, - int start, int end, int irq) -{ - struct b43_dmadesc64 *descbase = ring->descbase; - int slot; - u32 ctl0 = 0, ctl1 = 0; - u32 addrlo, addrhi; - u32 addrext; - - slot = (int)(&(desc->dma64) - descbase); - B43_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); - - addrlo = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_LOW); - addrhi = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_HIGH); - addrext = b43_dma_address(&ring->dev->dma, dmaaddr, B43_DMA_ADDR_EXT); - - if (slot == ring->nr_slots - 1) - ctl0 |= B43_DMA64_DCTL0_DTABLEEND; - if (start) - ctl0 |= B43_DMA64_DCTL0_FRAMESTART; - if (end) - ctl0 |= B43_DMA64_DCTL0_FRAMEEND; - if (irq) - ctl0 |= B43_DMA64_DCTL0_IRQ; - ctl1 |= bufsize & B43_DMA64_DCTL1_BYTECNT; - ctl1 |= (addrext << B43_DMA64_DCTL1_ADDREXT_SHIFT) - & B43_DMA64_DCTL1_ADDREXT_MASK; - - desc->dma64.control0 = cpu_to_le32(ctl0); - desc->dma64.control1 = cpu_to_le32(ctl1); - desc->dma64.address_low = cpu_to_le32(addrlo); - desc->dma64.address_high = cpu_to_le32(addrhi); -} - -static void op64_poke_tx(struct b43_dmaring *ring, int slot) -{ - b43_dma_write(ring, B43_DMA64_TXINDEX, - (u32) (slot * sizeof(struct b43_dmadesc64))); -} - -static void op64_tx_suspend(struct b43_dmaring *ring) -{ - b43_dma_write(ring, B43_DMA64_TXCTL, b43_dma_read(ring, B43_DMA64_TXCTL) - | B43_DMA64_TXSUSPEND); -} - -static void op64_tx_resume(struct b43_dmaring *ring) -{ - b43_dma_write(ring, B43_DMA64_TXCTL, b43_dma_read(ring, B43_DMA64_TXCTL) - & ~B43_DMA64_TXSUSPEND); -} - -static int op64_get_current_rxslot(struct b43_dmaring *ring) -{ - u32 val; - - val = b43_dma_read(ring, B43_DMA64_RXSTATUS); - val &= B43_DMA64_RXSTATDPTR; - - return (val / sizeof(struct b43_dmadesc64)); -} - -static void op64_set_current_rxslot(struct b43_dmaring *ring, int slot) -{ - b43_dma_write(ring, B43_DMA64_RXINDEX, - (u32) (slot * sizeof(struct b43_dmadesc64))); -} - -static const struct b43_dma_ops dma64_ops = { - .idx2desc = op64_idx2desc, - .fill_descriptor = op64_fill_descriptor, - .poke_tx = op64_poke_tx, - .tx_suspend = op64_tx_suspend, - .tx_resume = op64_tx_resume, - .get_current_rxslot = op64_get_current_rxslot, - .set_current_rxslot = op64_set_current_rxslot, -}; - -static inline int free_slots(struct b43_dmaring *ring) -{ - return (ring->nr_slots - ring->used_slots); -} - -static inline int next_slot(struct b43_dmaring *ring, int slot) -{ - B43_WARN_ON(!(slot >= -1 && slot <= ring->nr_slots - 1)); - if (slot == ring->nr_slots - 1) - return 0; - return slot + 1; -} - -static inline int prev_slot(struct b43_dmaring *ring, int slot) -{ - B43_WARN_ON(!(slot >= 0 && slot <= ring->nr_slots - 1)); - if (slot == 0) - return ring->nr_slots - 1; - return slot - 1; -} - -#ifdef CONFIG_B43_DEBUG -static void update_max_used_slots(struct b43_dmaring *ring, - int current_used_slots) -{ - if (current_used_slots <= ring->max_used_slots) - return; - ring->max_used_slots = current_used_slots; - if (b43_debug(ring->dev, B43_DBG_DMAVERBOSE)) { - b43dbg(ring->dev->wl, - "max_used_slots increased to %d on %s ring %d\n", - ring->max_used_slots, - ring->tx ? "TX" : "RX", ring->index); - } -} -#else -static inline - void update_max_used_slots(struct b43_dmaring *ring, int current_used_slots) -{ -} -#endif /* DEBUG */ - -/* Request a slot for usage. */ -static inline int request_slot(struct b43_dmaring *ring) -{ - int slot; - - B43_WARN_ON(!ring->tx); - B43_WARN_ON(ring->stopped); - B43_WARN_ON(free_slots(ring) == 0); - - slot = next_slot(ring, ring->current_slot); - ring->current_slot = slot; - ring->used_slots++; - - update_max_used_slots(ring, ring->used_slots); - - return slot; -} - -static u16 b43_dmacontroller_base(enum b43_dmatype type, int controller_idx) -{ - static const u16 map64[] = { - B43_MMIO_DMA64_BASE0, - B43_MMIO_DMA64_BASE1, - B43_MMIO_DMA64_BASE2, - B43_MMIO_DMA64_BASE3, - B43_MMIO_DMA64_BASE4, - B43_MMIO_DMA64_BASE5, - }; - static const u16 map32[] = { - B43_MMIO_DMA32_BASE0, - B43_MMIO_DMA32_BASE1, - B43_MMIO_DMA32_BASE2, - B43_MMIO_DMA32_BASE3, - B43_MMIO_DMA32_BASE4, - B43_MMIO_DMA32_BASE5, - }; - - if (type == B43_DMA_64BIT) { - B43_WARN_ON(!(controller_idx >= 0 && - controller_idx < ARRAY_SIZE(map64))); - return map64[controller_idx]; - } - B43_WARN_ON(!(controller_idx >= 0 && - controller_idx < ARRAY_SIZE(map32))); - return map32[controller_idx]; -} - -static inline - dma_addr_t map_descbuffer(struct b43_dmaring *ring, - unsigned char *buf, size_t len, int tx) -{ - dma_addr_t dmaaddr; - - if (tx) { - dmaaddr = dma_map_single(ring->dev->dev->dma_dev, - buf, len, DMA_TO_DEVICE); - } else { - dmaaddr = dma_map_single(ring->dev->dev->dma_dev, - buf, len, DMA_FROM_DEVICE); - } - - return dmaaddr; -} - -static inline - void unmap_descbuffer(struct b43_dmaring *ring, - dma_addr_t addr, size_t len, int tx) -{ - if (tx) { - dma_unmap_single(ring->dev->dev->dma_dev, - addr, len, DMA_TO_DEVICE); - } else { - dma_unmap_single(ring->dev->dev->dma_dev, - addr, len, DMA_FROM_DEVICE); - } -} - -static inline - void sync_descbuffer_for_cpu(struct b43_dmaring *ring, - dma_addr_t addr, size_t len) -{ - B43_WARN_ON(ring->tx); - dma_sync_single_for_cpu(ring->dev->dev->dma_dev, - addr, len, DMA_FROM_DEVICE); -} - -static inline - void sync_descbuffer_for_device(struct b43_dmaring *ring, - dma_addr_t addr, size_t len) -{ - B43_WARN_ON(ring->tx); - dma_sync_single_for_device(ring->dev->dev->dma_dev, - addr, len, DMA_FROM_DEVICE); -} - -static inline - void free_descriptor_buffer(struct b43_dmaring *ring, - struct b43_dmadesc_meta *meta) -{ - if (meta->skb) { - if (ring->tx) - ieee80211_free_txskb(ring->dev->wl->hw, meta->skb); - else - dev_kfree_skb_any(meta->skb); - meta->skb = NULL; - } -} - -static int alloc_ringmemory(struct b43_dmaring *ring) -{ - /* The specs call for 4K buffers for 30- and 32-bit DMA with 4K - * alignment and 8K buffers for 64-bit DMA with 8K alignment. - * In practice we could use smaller buffers for the latter, but the - * alignment is really important because of the hardware bug. If bit - * 0x00001000 is used in DMA address, some hardware (like BCM4331) - * copies that bit into B43_DMA64_RXSTATUS and we get false values from - * B43_DMA64_RXSTATDPTR. Let's just use 8K buffers even if we don't use - * more than 256 slots for ring. - */ - u16 ring_mem_size = (ring->type == B43_DMA_64BIT) ? - B43_DMA64_RINGMEMSIZE : B43_DMA32_RINGMEMSIZE; - - ring->descbase = dma_zalloc_coherent(ring->dev->dev->dma_dev, - ring_mem_size, &(ring->dmabase), - GFP_KERNEL); - if (!ring->descbase) - return -ENOMEM; - - return 0; -} - -static void free_ringmemory(struct b43_dmaring *ring) -{ - u16 ring_mem_size = (ring->type == B43_DMA_64BIT) ? - B43_DMA64_RINGMEMSIZE : B43_DMA32_RINGMEMSIZE; - dma_free_coherent(ring->dev->dev->dma_dev, ring_mem_size, - ring->descbase, ring->dmabase); -} - -/* Reset the RX DMA channel */ -static int b43_dmacontroller_rx_reset(struct b43_wldev *dev, u16 mmio_base, - enum b43_dmatype type) -{ - int i; - u32 value; - u16 offset; - - might_sleep(); - - offset = (type == B43_DMA_64BIT) ? B43_DMA64_RXCTL : B43_DMA32_RXCTL; - b43_write32(dev, mmio_base + offset, 0); - for (i = 0; i < 10; i++) { - offset = (type == B43_DMA_64BIT) ? B43_DMA64_RXSTATUS : - B43_DMA32_RXSTATUS; - value = b43_read32(dev, mmio_base + offset); - if (type == B43_DMA_64BIT) { - value &= B43_DMA64_RXSTAT; - if (value == B43_DMA64_RXSTAT_DISABLED) { - i = -1; - break; - } - } else { - value &= B43_DMA32_RXSTATE; - if (value == B43_DMA32_RXSTAT_DISABLED) { - i = -1; - break; - } - } - msleep(1); - } - if (i != -1) { - b43err(dev->wl, "DMA RX reset timed out\n"); - return -ENODEV; - } - - return 0; -} - -/* Reset the TX DMA channel */ -static int b43_dmacontroller_tx_reset(struct b43_wldev *dev, u16 mmio_base, - enum b43_dmatype type) -{ - int i; - u32 value; - u16 offset; - - might_sleep(); - - for (i = 0; i < 10; i++) { - offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXSTATUS : - B43_DMA32_TXSTATUS; - value = b43_read32(dev, mmio_base + offset); - if (type == B43_DMA_64BIT) { - value &= B43_DMA64_TXSTAT; - if (value == B43_DMA64_TXSTAT_DISABLED || - value == B43_DMA64_TXSTAT_IDLEWAIT || - value == B43_DMA64_TXSTAT_STOPPED) - break; - } else { - value &= B43_DMA32_TXSTATE; - if (value == B43_DMA32_TXSTAT_DISABLED || - value == B43_DMA32_TXSTAT_IDLEWAIT || - value == B43_DMA32_TXSTAT_STOPPED) - break; - } - msleep(1); - } - offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXCTL : B43_DMA32_TXCTL; - b43_write32(dev, mmio_base + offset, 0); - for (i = 0; i < 10; i++) { - offset = (type == B43_DMA_64BIT) ? B43_DMA64_TXSTATUS : - B43_DMA32_TXSTATUS; - value = b43_read32(dev, mmio_base + offset); - if (type == B43_DMA_64BIT) { - value &= B43_DMA64_TXSTAT; - if (value == B43_DMA64_TXSTAT_DISABLED) { - i = -1; - break; - } - } else { - value &= B43_DMA32_TXSTATE; - if (value == B43_DMA32_TXSTAT_DISABLED) { - i = -1; - break; - } - } - msleep(1); - } - if (i != -1) { - b43err(dev->wl, "DMA TX reset timed out\n"); - return -ENODEV; - } - /* ensure the reset is completed. */ - msleep(1); - - return 0; -} - -/* Check if a DMA mapping address is invalid. */ -static bool b43_dma_mapping_error(struct b43_dmaring *ring, - dma_addr_t addr, - size_t buffersize, bool dma_to_device) -{ - if (unlikely(dma_mapping_error(ring->dev->dev->dma_dev, addr))) - return true; - - switch (ring->type) { - case B43_DMA_30BIT: - if ((u64)addr + buffersize > (1ULL << 30)) - goto address_error; - break; - case B43_DMA_32BIT: - if ((u64)addr + buffersize > (1ULL << 32)) - goto address_error; - break; - case B43_DMA_64BIT: - /* Currently we can't have addresses beyond - * 64bit in the kernel. */ - break; - } - - /* The address is OK. */ - return false; - -address_error: - /* We can't support this address. Unmap it again. */ - unmap_descbuffer(ring, addr, buffersize, dma_to_device); - - return true; -} - -static bool b43_rx_buffer_is_poisoned(struct b43_dmaring *ring, struct sk_buff *skb) -{ - unsigned char *f = skb->data + ring->frameoffset; - - return ((f[0] & f[1] & f[2] & f[3] & f[4] & f[5] & f[6] & f[7]) == 0xFF); -} - -static void b43_poison_rx_buffer(struct b43_dmaring *ring, struct sk_buff *skb) -{ - struct b43_rxhdr_fw4 *rxhdr; - unsigned char *frame; - - /* This poisons the RX buffer to detect DMA failures. */ - - rxhdr = (struct b43_rxhdr_fw4 *)(skb->data); - rxhdr->frame_len = 0; - - B43_WARN_ON(ring->rx_buffersize < ring->frameoffset + sizeof(struct b43_plcp_hdr6) + 2); - frame = skb->data + ring->frameoffset; - memset(frame, 0xFF, sizeof(struct b43_plcp_hdr6) + 2 /* padding */); -} - -static int setup_rx_descbuffer(struct b43_dmaring *ring, - struct b43_dmadesc_generic *desc, - struct b43_dmadesc_meta *meta, gfp_t gfp_flags) -{ - dma_addr_t dmaaddr; - struct sk_buff *skb; - - B43_WARN_ON(ring->tx); - - skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); - if (unlikely(!skb)) - return -ENOMEM; - b43_poison_rx_buffer(ring, skb); - dmaaddr = map_descbuffer(ring, skb->data, ring->rx_buffersize, 0); - if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) { - /* ugh. try to realloc in zone_dma */ - gfp_flags |= GFP_DMA; - - dev_kfree_skb_any(skb); - - skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); - if (unlikely(!skb)) - return -ENOMEM; - b43_poison_rx_buffer(ring, skb); - dmaaddr = map_descbuffer(ring, skb->data, - ring->rx_buffersize, 0); - if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) { - b43err(ring->dev->wl, "RX DMA buffer allocation failed\n"); - dev_kfree_skb_any(skb); - return -EIO; - } - } - - meta->skb = skb; - meta->dmaaddr = dmaaddr; - ring->ops->fill_descriptor(ring, desc, dmaaddr, - ring->rx_buffersize, 0, 0, 0); - - return 0; -} - -/* Allocate the initial descbuffers. - * This is used for an RX ring only. - */ -static int alloc_initial_descbuffers(struct b43_dmaring *ring) -{ - int i, err = -ENOMEM; - struct b43_dmadesc_generic *desc; - struct b43_dmadesc_meta *meta; - - for (i = 0; i < ring->nr_slots; i++) { - desc = ring->ops->idx2desc(ring, i, &meta); - - err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL); - if (err) { - b43err(ring->dev->wl, - "Failed to allocate initial descbuffers\n"); - goto err_unwind; - } - } - mb(); - ring->used_slots = ring->nr_slots; - err = 0; - out: - return err; - - err_unwind: - for (i--; i >= 0; i--) { - desc = ring->ops->idx2desc(ring, i, &meta); - - unmap_descbuffer(ring, meta->dmaaddr, ring->rx_buffersize, 0); - dev_kfree_skb(meta->skb); - } - goto out; -} - -/* Do initial setup of the DMA controller. - * Reset the controller, write the ring busaddress - * and switch the "enable" bit on. - */ -static int dmacontroller_setup(struct b43_dmaring *ring) -{ - int err = 0; - u32 value; - u32 addrext; - bool parity = ring->dev->dma.parity; - u32 addrlo; - u32 addrhi; - - if (ring->tx) { - if (ring->type == B43_DMA_64BIT) { - u64 ringbase = (u64) (ring->dmabase); - addrext = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_EXT); - addrlo = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_LOW); - addrhi = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_HIGH); - - value = B43_DMA64_TXENABLE; - value |= (addrext << B43_DMA64_TXADDREXT_SHIFT) - & B43_DMA64_TXADDREXT_MASK; - if (!parity) - value |= B43_DMA64_TXPARITYDISABLE; - b43_dma_write(ring, B43_DMA64_TXCTL, value); - b43_dma_write(ring, B43_DMA64_TXRINGLO, addrlo); - b43_dma_write(ring, B43_DMA64_TXRINGHI, addrhi); - } else { - u32 ringbase = (u32) (ring->dmabase); - addrext = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_EXT); - addrlo = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_LOW); - - value = B43_DMA32_TXENABLE; - value |= (addrext << B43_DMA32_TXADDREXT_SHIFT) - & B43_DMA32_TXADDREXT_MASK; - if (!parity) - value |= B43_DMA32_TXPARITYDISABLE; - b43_dma_write(ring, B43_DMA32_TXCTL, value); - b43_dma_write(ring, B43_DMA32_TXRING, addrlo); - } - } else { - err = alloc_initial_descbuffers(ring); - if (err) - goto out; - if (ring->type == B43_DMA_64BIT) { - u64 ringbase = (u64) (ring->dmabase); - addrext = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_EXT); - addrlo = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_LOW); - addrhi = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_HIGH); - - value = (ring->frameoffset << B43_DMA64_RXFROFF_SHIFT); - value |= B43_DMA64_RXENABLE; - value |= (addrext << B43_DMA64_RXADDREXT_SHIFT) - & B43_DMA64_RXADDREXT_MASK; - if (!parity) - value |= B43_DMA64_RXPARITYDISABLE; - b43_dma_write(ring, B43_DMA64_RXCTL, value); - b43_dma_write(ring, B43_DMA64_RXRINGLO, addrlo); - b43_dma_write(ring, B43_DMA64_RXRINGHI, addrhi); - b43_dma_write(ring, B43_DMA64_RXINDEX, ring->nr_slots * - sizeof(struct b43_dmadesc64)); - } else { - u32 ringbase = (u32) (ring->dmabase); - addrext = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_EXT); - addrlo = b43_dma_address(&ring->dev->dma, ringbase, B43_DMA_ADDR_LOW); - - value = (ring->frameoffset << B43_DMA32_RXFROFF_SHIFT); - value |= B43_DMA32_RXENABLE; - value |= (addrext << B43_DMA32_RXADDREXT_SHIFT) - & B43_DMA32_RXADDREXT_MASK; - if (!parity) - value |= B43_DMA32_RXPARITYDISABLE; - b43_dma_write(ring, B43_DMA32_RXCTL, value); - b43_dma_write(ring, B43_DMA32_RXRING, addrlo); - b43_dma_write(ring, B43_DMA32_RXINDEX, ring->nr_slots * - sizeof(struct b43_dmadesc32)); - } - } - -out: - return err; -} - -/* Shutdown the DMA controller. */ -static void dmacontroller_cleanup(struct b43_dmaring *ring) -{ - if (ring->tx) { - b43_dmacontroller_tx_reset(ring->dev, ring->mmio_base, - ring->type); - if (ring->type == B43_DMA_64BIT) { - b43_dma_write(ring, B43_DMA64_TXRINGLO, 0); - b43_dma_write(ring, B43_DMA64_TXRINGHI, 0); - } else - b43_dma_write(ring, B43_DMA32_TXRING, 0); - } else { - b43_dmacontroller_rx_reset(ring->dev, ring->mmio_base, - ring->type); - if (ring->type == B43_DMA_64BIT) { - b43_dma_write(ring, B43_DMA64_RXRINGLO, 0); - b43_dma_write(ring, B43_DMA64_RXRINGHI, 0); - } else - b43_dma_write(ring, B43_DMA32_RXRING, 0); - } -} - -static void free_all_descbuffers(struct b43_dmaring *ring) -{ - struct b43_dmadesc_meta *meta; - int i; - - if (!ring->used_slots) - return; - for (i = 0; i < ring->nr_slots; i++) { - /* get meta - ignore returned value */ - ring->ops->idx2desc(ring, i, &meta); - - if (!meta->skb || b43_dma_ptr_is_poisoned(meta->skb)) { - B43_WARN_ON(!ring->tx); - continue; - } - if (ring->tx) { - unmap_descbuffer(ring, meta->dmaaddr, - meta->skb->len, 1); - } else { - unmap_descbuffer(ring, meta->dmaaddr, - ring->rx_buffersize, 0); - } - free_descriptor_buffer(ring, meta); - } -} - -static u64 supported_dma_mask(struct b43_wldev *dev) -{ - u32 tmp; - u16 mmio_base; - - switch (dev->dev->bus_type) { -#ifdef CONFIG_B43_BCMA - case B43_BUS_BCMA: - tmp = bcma_aread32(dev->dev->bdev, BCMA_IOST); - if (tmp & BCMA_IOST_DMA64) - return DMA_BIT_MASK(64); - break; -#endif -#ifdef CONFIG_B43_SSB - case B43_BUS_SSB: - tmp = ssb_read32(dev->dev->sdev, SSB_TMSHIGH); - if (tmp & SSB_TMSHIGH_DMA64) - return DMA_BIT_MASK(64); - break; -#endif - } - - mmio_base = b43_dmacontroller_base(0, 0); - b43_write32(dev, mmio_base + B43_DMA32_TXCTL, B43_DMA32_TXADDREXT_MASK); - tmp = b43_read32(dev, mmio_base + B43_DMA32_TXCTL); - if (tmp & B43_DMA32_TXADDREXT_MASK) - return DMA_BIT_MASK(32); - - return DMA_BIT_MASK(30); -} - -static enum b43_dmatype dma_mask_to_engine_type(u64 dmamask) -{ - if (dmamask == DMA_BIT_MASK(30)) - return B43_DMA_30BIT; - if (dmamask == DMA_BIT_MASK(32)) - return B43_DMA_32BIT; - if (dmamask == DMA_BIT_MASK(64)) - return B43_DMA_64BIT; - B43_WARN_ON(1); - return B43_DMA_30BIT; -} - -/* Main initialization function. */ -static -struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev, - int controller_index, - int for_tx, - enum b43_dmatype type) -{ - struct b43_dmaring *ring; - int i, err; - dma_addr_t dma_test; - - ring = kzalloc(sizeof(*ring), GFP_KERNEL); - if (!ring) - goto out; - - ring->nr_slots = B43_RXRING_SLOTS; - if (for_tx) - ring->nr_slots = B43_TXRING_SLOTS; - - ring->meta = kcalloc(ring->nr_slots, sizeof(struct b43_dmadesc_meta), - GFP_KERNEL); - if (!ring->meta) - goto err_kfree_ring; - for (i = 0; i < ring->nr_slots; i++) - ring->meta->skb = B43_DMA_PTR_POISON; - - ring->type = type; - ring->dev = dev; - ring->mmio_base = b43_dmacontroller_base(type, controller_index); - ring->index = controller_index; - if (type == B43_DMA_64BIT) - ring->ops = &dma64_ops; - else - ring->ops = &dma32_ops; - if (for_tx) { - ring->tx = true; - ring->current_slot = -1; - } else { - if (ring->index == 0) { - switch (dev->fw.hdr_format) { - case B43_FW_HDR_598: - ring->rx_buffersize = B43_DMA0_RX_FW598_BUFSIZE; - ring->frameoffset = B43_DMA0_RX_FW598_FO; - break; - case B43_FW_HDR_410: - case B43_FW_HDR_351: - ring->rx_buffersize = B43_DMA0_RX_FW351_BUFSIZE; - ring->frameoffset = B43_DMA0_RX_FW351_FO; - break; - } - } else - B43_WARN_ON(1); - } -#ifdef CONFIG_B43_DEBUG - ring->last_injected_overflow = jiffies; -#endif - - if (for_tx) { - /* Assumption: B43_TXRING_SLOTS can be divided by TX_SLOTS_PER_FRAME */ - BUILD_BUG_ON(B43_TXRING_SLOTS % TX_SLOTS_PER_FRAME != 0); - - ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME, - b43_txhdr_size(dev), - GFP_KERNEL); - if (!ring->txhdr_cache) - goto err_kfree_meta; - - /* test for ability to dma to txhdr_cache */ - dma_test = dma_map_single(dev->dev->dma_dev, - ring->txhdr_cache, - b43_txhdr_size(dev), - DMA_TO_DEVICE); - - if (b43_dma_mapping_error(ring, dma_test, - b43_txhdr_size(dev), 1)) { - /* ugh realloc */ - kfree(ring->txhdr_cache); - ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME, - b43_txhdr_size(dev), - GFP_KERNEL | GFP_DMA); - if (!ring->txhdr_cache) - goto err_kfree_meta; - - dma_test = dma_map_single(dev->dev->dma_dev, - ring->txhdr_cache, - b43_txhdr_size(dev), - DMA_TO_DEVICE); - - if (b43_dma_mapping_error(ring, dma_test, - b43_txhdr_size(dev), 1)) { - - b43err(dev->wl, - "TXHDR DMA allocation failed\n"); - goto err_kfree_txhdr_cache; - } - } - - dma_unmap_single(dev->dev->dma_dev, - dma_test, b43_txhdr_size(dev), - DMA_TO_DEVICE); - } - - err = alloc_ringmemory(ring); - if (err) - goto err_kfree_txhdr_cache; - err = dmacontroller_setup(ring); - if (err) - goto err_free_ringmemory; - - out: - return ring; - - err_free_ringmemory: - free_ringmemory(ring); - err_kfree_txhdr_cache: - kfree(ring->txhdr_cache); - err_kfree_meta: - kfree(ring->meta); - err_kfree_ring: - kfree(ring); - ring = NULL; - goto out; -} - -#define divide(a, b) ({ \ - typeof(a) __a = a; \ - do_div(__a, b); \ - __a; \ - }) - -#define modulo(a, b) ({ \ - typeof(a) __a = a; \ - do_div(__a, b); \ - }) - -/* Main cleanup function. */ -static void b43_destroy_dmaring(struct b43_dmaring *ring, - const char *ringname) -{ - if (!ring) - return; - -#ifdef CONFIG_B43_DEBUG - { - /* Print some statistics. */ - u64 failed_packets = ring->nr_failed_tx_packets; - u64 succeed_packets = ring->nr_succeed_tx_packets; - u64 nr_packets = failed_packets + succeed_packets; - u64 permille_failed = 0, average_tries = 0; - - if (nr_packets) - permille_failed = divide(failed_packets * 1000, nr_packets); - if (nr_packets) - average_tries = divide(ring->nr_total_packet_tries * 100, nr_packets); - - b43dbg(ring->dev->wl, "DMA-%u %s: " - "Used slots %d/%d, Failed frames %llu/%llu = %llu.%01llu%%, " - "Average tries %llu.%02llu\n", - (unsigned int)(ring->type), ringname, - ring->max_used_slots, - ring->nr_slots, - (unsigned long long)failed_packets, - (unsigned long long)nr_packets, - (unsigned long long)divide(permille_failed, 10), - (unsigned long long)modulo(permille_failed, 10), - (unsigned long long)divide(average_tries, 100), - (unsigned long long)modulo(average_tries, 100)); - } -#endif /* DEBUG */ - - /* Device IRQs are disabled prior entering this function, - * so no need to take care of concurrency with rx handler stuff. - */ - dmacontroller_cleanup(ring); - free_all_descbuffers(ring); - free_ringmemory(ring); - - kfree(ring->txhdr_cache); - kfree(ring->meta); - kfree(ring); -} - -#define destroy_ring(dma, ring) do { \ - b43_destroy_dmaring((dma)->ring, __stringify(ring)); \ - (dma)->ring = NULL; \ - } while (0) - -void b43_dma_free(struct b43_wldev *dev) -{ - struct b43_dma *dma; - - if (b43_using_pio_transfers(dev)) - return; - dma = &dev->dma; - - destroy_ring(dma, rx_ring); - destroy_ring(dma, tx_ring_AC_BK); - destroy_ring(dma, tx_ring_AC_BE); - destroy_ring(dma, tx_ring_AC_VI); - destroy_ring(dma, tx_ring_AC_VO); - destroy_ring(dma, tx_ring_mcast); -} - -static int b43_dma_set_mask(struct b43_wldev *dev, u64 mask) -{ - u64 orig_mask = mask; - bool fallback = false; - int err; - - /* Try to set the DMA mask. If it fails, try falling back to a - * lower mask, as we can always also support a lower one. */ - while (1) { - err = dma_set_mask_and_coherent(dev->dev->dma_dev, mask); - if (!err) - break; - if (mask == DMA_BIT_MASK(64)) { - mask = DMA_BIT_MASK(32); - fallback = true; - continue; - } - if (mask == DMA_BIT_MASK(32)) { - mask = DMA_BIT_MASK(30); - fallback = true; - continue; - } - b43err(dev->wl, "The machine/kernel does not support " - "the required %u-bit DMA mask\n", - (unsigned int)dma_mask_to_engine_type(orig_mask)); - return -EOPNOTSUPP; - } - if (fallback) { - b43info(dev->wl, "DMA mask fallback from %u-bit to %u-bit\n", - (unsigned int)dma_mask_to_engine_type(orig_mask), - (unsigned int)dma_mask_to_engine_type(mask)); - } - - return 0; -} - -/* Some hardware with 64-bit DMA seems to be bugged and looks for translation - * bit in low address word instead of high one. - */ -static bool b43_dma_translation_in_low_word(struct b43_wldev *dev, - enum b43_dmatype type) -{ - if (type != B43_DMA_64BIT) - return true; - -#ifdef CONFIG_B43_SSB - if (dev->dev->bus_type == B43_BUS_SSB && - dev->dev->sdev->bus->bustype == SSB_BUSTYPE_PCI && - !(pci_is_pcie(dev->dev->sdev->bus->host_pci) && - ssb_read32(dev->dev->sdev, SSB_TMSHIGH) & SSB_TMSHIGH_DMA64)) - return true; -#endif - return false; -} - -int b43_dma_init(struct b43_wldev *dev) -{ - struct b43_dma *dma = &dev->dma; - int err; - u64 dmamask; - enum b43_dmatype type; - - dmamask = supported_dma_mask(dev); - type = dma_mask_to_engine_type(dmamask); - err = b43_dma_set_mask(dev, dmamask); - if (err) - return err; - - switch (dev->dev->bus_type) { -#ifdef CONFIG_B43_BCMA - case B43_BUS_BCMA: - dma->translation = bcma_core_dma_translation(dev->dev->bdev); - break; -#endif -#ifdef CONFIG_B43_SSB - case B43_BUS_SSB: - dma->translation = ssb_dma_translation(dev->dev->sdev); - break; -#endif - } - dma->translation_in_low = b43_dma_translation_in_low_word(dev, type); - - dma->parity = true; -#ifdef CONFIG_B43_BCMA - /* TODO: find out which SSB devices need disabling parity */ - if (dev->dev->bus_type == B43_BUS_BCMA) - dma->parity = false; -#endif - - err = -ENOMEM; - /* setup TX DMA channels. */ - dma->tx_ring_AC_BK = b43_setup_dmaring(dev, 0, 1, type); - if (!dma->tx_ring_AC_BK) - goto out; - - dma->tx_ring_AC_BE = b43_setup_dmaring(dev, 1, 1, type); - if (!dma->tx_ring_AC_BE) - goto err_destroy_bk; - |